Multi-Driver Loudspeaker Assembly for Reduced Hand Reflection Coloration
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Solution Overview
Problem
Existing loudspeaker assemblies in hand-held devices suffer from significant sound coloration due to hand reflections, and exhibit response differences between channels when used in a hands-free mode.
Innovation Solution
The loudspeaker assembly incorporates a combination of loudspeaker units with specific configurations and signal processing to achieve a unidirectional polar pattern, reducing sound coloration by directing sound away from the user's hands and minimizing channel differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional loudspeaker assembly is used in hand-held mode, then the loudspeaker can output audio clearly, but significant sound coloration occurs due to reflections from the user's hands
Solution Approach 1:
The loudspeaker assembly is divided into multiple independent loudspeaker drivers (first loudspeaker driver, second loudspeaker driver, third loudspeaker driver) with different polar patterns. Each driver handles specific frequency ranges or directional requirements, allowing the system to cancel hand reflections while maintaining clear audio output.
Solution Approach 2:
The patent employs asymmetric polar pattern configurations where the first loudspeaker driver has an omnidirectional pattern while the second and third drivers have directional patterns. This asymmetric arrangement creates destructive interference for hand reflections while preserving forward audio quality.
2Ease of operation
If a conventional loudspeaker assembly is used in hands-free mode, then the loudspeaker can be held in front of the user's face, but response differences occur between channels due to hand reflections
Solution Approach 1:
The patent incorporates feedback mechanisms where the output of the loudspeaker drivers is monitored and processed through signal processing circuits. The system adjusts the signal to compensate for hand reflection effects, ensuring consistent channel response in hands-free mode.
Solution Approach 2:
The patent dynamically adjusts parameters such as phase, amplitude, and timing of the loudspeaker drivers based on detected hand position and reflection characteristics. This allows real-time compensation for channel response differences caused by hand reflections.
3Object-affected harmful factors
If multiple loudspeaker drivers with different polar patterns are used, then hand reflection coloration is reduced, but the device complexity increases
Solution Approach 1:
The patent combines multiple loudspeaker drivers with different polar patterns into a single integrated assembly that shares common housing, mounting structure, and control electronics. This merging approach reduces overall device complexity while maintaining the benefits of multiple drivers with different characteristics.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces sound coloration and channel differences caused by hand reflections, providing a clear and consistent audio experience across a desired frequency range.
Implementation Method 1
The at least one loudspeaker driver and the at least two ports are configured so that the loudspeaker assembly has a unidirectional polar pattern over a desired frequency range
Data Source
AI summary
A loudspeaker assembly and a hand-held device are provided. The loudspeaker assembly includes at least one loudspeaker driver and at least two output ports. The at least one loudspeaker driver and the at least two output ports are configured so that the loudspeaker assembly has a directive polar pattern over a desired frequency range.